Which of the following is an essential amino acid?
a) Glycine
b) Lysine
c) Alanine
d) Serine
Answer: b) Lysine

The bond between two monosaccharides in a disaccharide is called:
a) Peptide bond
b) Glycosidic bond
c) Hydrogen bond
d) Phosphodiester bond
Answer: b) Glycosidic bond

Which of the following is a ketose sugar?
a) Glucose
b) Fructose
c) Galactose
d) Ribose
Answer: b) Fructose

Which vitamin is necessary for the synthesis of collagen?
a) Vitamin A
b) Vitamin C
c) Vitamin D
d) Vitamin K
Answer: b) Vitamin C

Which of the following is a component of RNA but not DNA?
a) Adenine
b) Guanine
c) Thymine
d) Uracil
Answer: d) Uracil

Which enzyme is involved in the synthesis of mRNA from DNA?
a) DNA polymerase
b) RNA polymerase
c) Ligase
d) Helicase
Answer: b) RNA polymerase

Which of the following processes occurs in the mitochondria?
a) Glycolysis
b) Krebs cycle
c) Fermentation
d) Photosynthesis
Answer: b) Krebs cycle

The enzyme that breaks down lactose into glucose and galactose is:
a) Amylase
b) Lactase
c) Protease
d) Lipase
Answer: b) Lactase

What is the main function of hemoglobin in the blood?
a) To transport oxygen
b) To break down fats
c) To synthesize proteins
d) To store glucose
Answer: a) To transport oxygen

Which of the following is a polymer of glucose?
a) Sucrose
b) Starch
c) Lactose
d) Fructose
Answer: b) Starch